11990871 has 6 divisors (see below), whose sum is σ = 17320160. Its totient is φ = 7993908.

The previous prime is 11990863. The next prime is 11990873. The reversal of 11990871 is 17809911.

It is not a de Polignac number, because 11990871 - 2³ = 11990863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11990873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666151 + ... + 666168.

Almost surely, 2^11990871 is an apocalyptic number.

11990871 is a deficient number, since it is larger than the sum of its proper divisors (5329289).

11990871 is a wasteful number, since it uses less digits than its factorization.

11990871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332325 (or 1332322 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 11990871 is about 3462.7837067885. The cubic root of 11990871 is about 228.8847776917.

The spelling of 11990871 in words is "eleven million, nine hundred ninety thousand, eight hundred seventy-one".